Drilling and centering attachment for turret lathes



Oct. 14, 1952 o. SCHULTZ DRILLING AND CENTBRING ATTACHMENT FOR TURRET LATHES :Filed Dan. 24, 1949 INVENTOR. Orra .Sawzrz Patented Oct. 14, 1952 DRILLING AND CENTERING ATTACHMENT FOR. TURRET LATHES Otto Schultz, Cleveland, Ohio, assignor to Schultz Manufacturing Company, Cleveland, Ohio, a

partnership Application December 24, 1949, Serial No. 135,019

2 Claims.

This invention is for a stock stop and centering drill attachment for a turret lathe.

One object of my present invention is to provide such an attachment that may serve as a stop means for the stock so as to determine in advance the extent to which the stock should be moved for the performance of a desired operation and that may serve as a stop means for the stock also upon completion of the operation.

Another object is to devise such an attachment that is adapted for drilling small holes or for Starting the drilling of large holes and for ensuring at the same time the centering of the tool for completing the large hole.

Another object is to provide a convenient and efficient means for moving the tool into and out of operative position and for dependably holding the same in operative position;

Another object is to devise such an attachment with a convenient and efficient means for adjust ing the extent of projection of the tool from the holder when in operative position.

Another object is to devise such an attachment with a freely rotatable cap in operative relation to the tool and hence to the work so as to afford means of engagement by the work and so as to thereby preclude the danger of marring the work as it comes into engagement with the tool holder.

Other objects will appear from the following description and claims when considered together with the accompanying drawing.

Fig. 1 is a top plan view of part of a turret lathe in which my present attachment is installed;

Fig, 2 is a top plan view of the attachment itself;

Fig. 3 is a vertical longitudinal sectional view of my attachment;

Fig. 4 is a front end elevation of the same; and

Fig. 5 is a sectional view taken on line 5-5 of Fig. 3.

It is to be understood that the present form of disclosure is merely for the purpose of illustration and that there might be devised various modifications thereof without departing from the spirit of my invention as herein set forth and claimed.

Referring now to the accompanying drawing, the rear end portion 2 of the housing I is adapted to be mounted in a turret lathe L, as indicated in a general way in Fig. 1 of the drawing. This housing I is of hollow form and has mounted therewithin the tool holder 3 which, in turn, has

. the screw 4 therewithin and accessible from the rear end thereof. The screw 6 may be locked in adjusted position by means of the set screw 5. The forward end of the screw 4 is formed with the jaws 4a to receive the rear end of the tool 6 which extends out through the forward end portion of the holder 3 which, in turn, affords means of substantial and dependable supporting engagement for the forward end portion of the body of the tool 6, as indicated in Fig. 3 of the present drawing.

The handle I extends through an opening 8 in the housing I and has screw-threaded engagement with the tool holder 3 and has its inner end adapted for securing engagement with the grooved portion in the rear end of the tool 8 or with one of the jaws ta so as to hold the tool in set position. The handle I may have fiat portions for gripping the same by a Wrench for more effective turning of the same.

The opening 8 is of angular or bayonet-like form and includes a longitudinally extending portion and a circuinierentially extending portion; and the longitudinally extending portion is of such length that it will accommodate the adjustment of the handle l in its movement of the tool holder and tool from inactive to active po sition. The transverse or circumferential portion of the opening 8 corresponds to active or forward position of the handle; and the engagement of the handle therewithin, after it has been moved fully thereinto, will serve to hold the same in such position, there being sufficient frictional engagement of the holder 3 within the housing to ensure against accidental displacement of the sam from the position to which it has been adjusted, especially after the handle I has been brought into the closed end of the lateral or circumferential portion of the opening 8. The longitudinal part of the opening 8 may also permit access to the set screw 5, which means a convenience in re-setting the screw 4.

Fixed within the forward end of the housing I there is the bushing 9 which extends forwardli therefrom and afiords support for the ball bearing assembly Ill. Mounted upon the ball bearing assembly In there is the centrally apertured cap I I which is thus capable of freely rotatable movement about the end of the holder I.

As indicated in Fig. 3 of the drawing, the tool 8 is adapted to extend beyond the cap I I to operative position and to be withdrawn therewithin to rearward or idle position.

With my present device, there is provided a convenient and eirective means for setting the tool in the desired position in its holder and for securing the same therewithin, and also for moving the same into and out of active position and for holding the same in active position.

With the tool 6 properly set in its holder for the depth of cut desired in the stock and with the holder in withdrawn or inactive position and with the turret set at proper position, the stock may be moved into engagement preliminarily with the face of the cap II in order to ascertain the extent of travel of the stock required for the desired operation. Then the stock will be withdrawn and the tool 6 will be set in active position preparatory to initiating the cutting operation. When the operation has been completed, the stock will have been brought into engagement with the cap H, which can be ascertained visually by the operator who will see the cap being rotated by contact of the work therewith. Thus my attachment serves as a stop for the stock and also there is obtained a visual indication of the completion of the operation.

Furthermore, rotation of the cap II by the work as it comes into contact therewith, will prevent marring of the work, which would result in the case of a stationary end of the housing against which the work would come into engagement; and thus there may be precluded the necessity of facing the work after the drilling operation.

This device may be employed to drill a small hole upon a true center and may be employed also to initiate the drilling of a larger hole which may be completed by means of a larger drill without the necessity of a separate centering operation prior to the operation of the larger drill. That is to say, in the case of small holes, they may be drilled completely in a single operation; and the initial step in the drilling of larger holes may be performed in such manner that there is eliminated any necessity of centering as a separate operation for the larger drill. Thus there may be realized a decided saving in the number of manipulations and operations in the complete performance of a piece of work, with consequent saving in time and labor, which of course means a saving in cost.

What I claim is:

1. A center drill attachment for a turret lathe, comprising a housing adapted for attachment in the turret, said housing having an open forward end for projection of a tool end therethrough into operative position, a tool holder mounted within said housing and adapted for adjustment longitudinally and rotatably therewithin, a tool within the forward end of said holder, a handle extending radially through said holder and an opening in said housing for operative holding engagement with the rear end portion of said tool, said opening in said housing being of angular form and including a longitudinally extending portion and a circumferentially extending portion at the forward end thereof, the longitudinal extent of said opening corresponding to the extent of adjustment of said tool from withdrawn inactive position to extended active position, and said circumferentially extending portion of said opening being adapted to hold the handle in forward position corresponding to active position of the tool.

2. A center drill attachment for a turret lathe, comprising a hollow housing adapted for attachment to the turret, a tool holder mounted within said housing and adapted for adjustment longitudinally and rotatably therewithin, a tool projecting from the forward end of said holder, a screw axially adjustable within the rear end of said holder and having operative engagement with the rear end of said tool, a set screw in said holder for locking said screw in adjusted position, and a handle extending radially through said holder and an opening in said housing for operative holding engagement with the rear end portion of said tool, said opening in said housing being of angular form and including a longitudinally extending portion and a circumferentially extending portion at the forward end thereof, the longitudinal extent of said opening corresponding to the extent of adjustment of said tool from withdrawn inactive position to extended active position, and said circumferentially extending portion of said opening being adapted to hold said handle in forward position corresponding to active position of said tool.

OTTO SCHULTZ.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,028,855 Blomstrom June 11, 1912 1,152,070 Borgeson Aug. 31, 1915 2,188,624 Dantry et a1 Jan. 30, 1940 2,408,652 King Oct. 1, 1946 FOREIGN PATENTS Number Country Date 109,102 Great Britain Sept. 1, 1917 

